-----------------------------------------------------------------------------------------------------------------------The periodic table of elements shown above is a tabular expression of the trends and characteristics of the earth's elements.
This table, to the naked eye, shows only the atomic number and atomic mass along with each elements chemical symbol, however, it shows much much more.
When given a large number of elements and told to organize them one must find their similarities.
In short, this table is a representation of each elements related characteristics.
These traits lead to trends, and those trends lead to a pattern in which to organize the elements.
----------------------------------------------------------------------------------------------------------------------------------------- Second, each element is categorized into one of four blocks.
These block are referred as the s, p, d, and f blocks of the periodic table.
The placement of the elements in these blocks is determined by the number of electron they have in their outermost energy levels.
The s-block contains groups 1A and 2A of the table, the d-block contains groups 3B - 12B, the p-block contains groups 13A - 18A, and the f-block contains the elements 57 - 70 and 89 - 102.
The similarity of their valence electron configuration will then determine which elements are to be placed in which part of the table, this begins a pattern.
----------------------------------------------------------------------------------------------------------------------------------------- As one can see the properties above also tie into the characteristics already listed and narrow the placement of each element down even further. ----------------------------------------------------------------------------------------------------------------------------------------- In the day of Dmitri Mendeleev and several other scientist they were simply given the huge list of elements and told to place them in a logical table or chart in which made sense. In doing so, Mendeleev created the first periodic table of elements. He ,of course, looked at multiple similarities and differences like the ones listed above but he also took into account many other traits of each element. The most prominent being each elements atom mass, ionization energy, and electronegativity. These, however, were not the only characteristics Mendeleev looked at but he found the most comparison between those three. This was only the beginning for Mendeleev and many others in the discovery and formation of the periodic table of elements. -----------------------------------------------------------------------------------------------------------------------------------------"Curran, Lesson 3-4" "Google"
-----------------------------------------------------------------------------------------------------------------------The periodic table of elements shown above is a tabular expression of the trends and characteristics of the earth's elements.
This table, to the naked eye, shows only the atomic number and atomic mass along with each elements chemical symbol, however, it shows much much more.
When given a large number of elements and told to organize them one must find their similarities.
In short, this table is a representation of each elements related characteristics.
These traits lead to trends, and those trends lead to a pattern in which to organize the elements.
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First, the elements of the periodic table are put into groups or families and periods.
Groups or families represent the columns of the table, and the periods represent the rows of the table.
Elements in each group or family show similar characteristics, and the elements in each period show similar characteristics.
This provides a basis for the periodic table to develope.
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Second, each element is categorized into one of four blocks.
These block are referred as the s, p, d, and f blocks of the periodic table.
The placement of the elements in these blocks is determined by the number of electron they have in their outermost energy levels.
The s-block contains groups 1A and 2A of the table, the d-block contains groups 3B - 12B, the p-block contains groups 13A - 18A, and the f-block contains the elements 57 - 70 and 89 - 102.
The similarity of their valence electron configuration will then determine which elements are to be placed in which part of the table, this begins a pattern.
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Third, each elements is dubbed either a metal, a metalloid, or a nonmetal.
Metals make up most of the periodic table.
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As one can see the properties above also tie into the characteristics already listed and narrow the placement of each element down even further.
-----------------------------------------------------------------------------------------------------------------------------------------
In the day of Dmitri Mendeleev and several other scientist they were simply given the huge list of elements and told to place them in a logical table or chart in which made sense.
In doing so, Mendeleev created the first periodic table of elements.
He ,of course, looked at multiple similarities and differences like the ones listed above but he also took into account many other traits of each element.
The most prominent being each elements atom mass, ionization energy, and electronegativity.
These, however, were not the only characteristics Mendeleev looked at but he found the most comparison between those three.
This was only the beginning for Mendeleev and many others in the discovery and formation of the periodic table of elements.
-----------------------------------------------------------------------------------------------------------------------------------------"Curran, Lesson 3-4"
"Google"